Antwoord op "Correct battery clibration after replacement"Apple no longer recommends “calibrating” batteries on Unibody MBs or newer. The batteries are smarter now.
Antwoord op "SSD problem can't format"I had an Apple-label Samsung SSD in a Mini go bad -- it could be read, sort of, but many disk operations were unsuccessful, and formatting it just crashed. So I replaced it. But eventually I was able to revive the Samsung by connecting it directly to SATA in a PC and formatting it as a Windows drive using a freebie Wintel disk formatter. Then I was able to use a USB case to connect the SSD to a Mac and format it as APFS.